/**
 * @brief Standard Input/Output Library
 * 
 * This header file provides the core input and output capabilities in C.
 * It contains declarations for functions like printf, scanf, etc. that perform
 * standard I/O operations. This is one of the most commonly used header files
 * in C programming.
 * 
 * Common functions include:
 * - printf(): Formatted output to stdout
 * - scanf(): Formatted input from stdin
 * - getchar(): Read a character from stdin
 * - putchar(): Write a character to stdout
 * - and many more...
 */
#include <stdio.h>

int main() {
    double inches;
    printf("请输入英寸值：");
    scanf("%lf", &inches);
    
    double centimeters = inches * 2.54;
    printf("%.2f 英寸 = %.2f 厘米\n", inches, centimeters);
    
    return 0;
}